A laundry uses an elevator to move items from one level to another. The elevator has a mass of 650 kg and moves upward with constant acceleration for 4.50 s until it reaches its cruising speed of 1.75 m/s. (Note: 1 hp (a) What is the average power (in hp) of the elevator motor during this time interval? Pave hp (b) What is the motor power (in hp) when the elevator moves at its cruising speed? Pcruising hp = 746 W.) (c) What If? If the elevator motor can only deliver constant power at one setting, the amount needed for its motion at constant speed, how long (in s) will it take the elevator to accelerate to the cruising speed of 1.75 m/s? (If you need to use co or -co, enter INFINITY or -INFINITY, respectively.) t S